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1 | use MooseX::Declare; |
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2 | |
3 | |
4 | class SQL::Abstract { |
5 | |
6 | use Carp qw/croak/; |
7 | use Data::Dump qw/pp/; |
8 | |
9 | use Moose::Util::TypeConstraints; |
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10 | use MooseX::Types -declare => [qw/NameSeparator/]; |
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11 | use MooseX::Types::Moose qw/ArrayRef Str Int HashRef CodeRef/; |
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12 | use MooseX::AttributeHelpers; |
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13 | use SQL::Abstract::Types qw/NameSeparator QuoteChars AST HashAST ArrayAST/; |
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14 | use Devel::PartialDump qw/dump/; |
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15 | |
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16 | clean; |
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17 | |
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18 | our $VERSION = '2.000000'; |
19 | |
20 | our $AST_VERSION = '1'; |
21 | |
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22 | # Operator precedence for bracketing |
23 | our %PRIO = ( |
24 | and => 10, |
25 | or => 50 |
26 | ); |
27 | |
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28 | our %BINOP_MAP = ( |
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29 | '>' => '>', |
30 | '<' => '<', |
31 | '==' => '=', |
32 | '!=' => '!=', |
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33 | # LIKE is always "field LIKE <value>" |
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34 | '-like' => 'LIKE', |
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35 | '-not_like' => 'NOT LIKE', |
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36 | ); |
37 | |
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38 | has expr_dispatch_table => ( |
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39 | is => 'ro', |
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40 | lazy => 1, |
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41 | builder => '_build_expr_dispatch_table', |
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42 | isa => HashRef[CodeRef], |
43 | metaclass => 'Collection::ImmutableHash', |
44 | provides => { |
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45 | get => 'lookup_expr_dispatch' |
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46 | } |
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47 | ); |
48 | |
49 | has binop_map => ( |
50 | is => 'ro', |
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51 | lazy => 1, |
52 | builder => '_build_binops', |
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53 | isa => HashRef, |
54 | metaclass => 'Collection::ImmutableHash', |
55 | provides => { |
56 | exists => 'is_valid_binop', |
57 | get => 'binop_mapping', |
58 | keys => 'binary_operators' |
59 | } |
60 | ); |
61 | |
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62 | # List of default binary operators (for in where clauses) |
63 | sub _build_binops { return {%BINOP_MAP} }; |
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64 | |
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65 | method _build_expr_dispatch_table { |
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66 | my $binop = $self->can('_binop') or croak "InternalError: $self can't do _binop!"; |
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67 | return { |
68 | map { $_ => $binop } $self->binary_operators |
69 | } |
70 | } |
71 | |
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72 | has ast_version => ( |
73 | is => 'ro', |
74 | isa => Int, |
75 | required => 1 |
76 | ); |
77 | |
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78 | has name_separator => ( |
79 | is => 'rw', |
80 | isa => NameSeparator, |
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81 | default => '.', |
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82 | coerece => 1, |
83 | required => 1, |
84 | ); |
85 | |
86 | has list_separator => ( |
87 | is => 'rw', |
88 | isa => Str, |
89 | default => ', ', |
90 | required => 1, |
91 | ); |
92 | |
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93 | has quote_chars => ( |
94 | is => 'rw', |
95 | isa => QuoteChars, |
96 | coerece => 1, |
97 | predicate => 'is_quoting', |
98 | clearer => 'disable_quoting', |
99 | ); |
100 | |
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101 | has binds => ( |
102 | isa => ArrayRef, |
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103 | is => 'ro', |
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104 | clearer => '_clear_binds', |
105 | lazy => 1, |
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106 | default => sub { [ ] }, |
107 | metaclass => 'Collection::Array', |
108 | provides => { |
109 | push => 'add_bind', |
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110 | } |
111 | ); |
112 | |
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113 | # TODO: once MXMS supports %args, use that here |
114 | method create(ClassName $class: Int $ver) { |
115 | croak "AST version $ver is greater than supported version of $AST_VERSION" |
116 | if $ver > $AST_VERSION; |
117 | |
118 | my $name = "${class}::AST::v$ver"; |
119 | Class::MOP::load_class($name); |
120 | |
121 | return $name->new(ast_version => $ver); |
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122 | } |
123 | |
124 | # Main entry point |
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125 | method generate(ClassName $class: HashAST $ast) { |
126 | my $ver = $ast->{-ast_version}; |
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127 | croak "SQL::Abstract AST version not specified" |
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128 | unless defined $ver; |
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129 | |
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130 | # TODO: once MXMS supports %args, use that here |
131 | my $self = $class->create($ver); |
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132 | |
133 | return ($self->dispatch($ast), $self->binds); |
134 | } |
135 | |
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136 | method reset() { |
137 | $self->_clear_binds(); |
138 | } |
139 | |
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140 | method dispatch (AST $ast) { |
141 | # I want multi methods! |
142 | my $tag; |
143 | if (is_ArrayAST($ast)) { |
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144 | confess "FIX: " . dump($ast); |
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145 | } else { |
146 | $tag = "_" . $ast->{-type}; |
147 | } |
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148 | |
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149 | my $meth = $self->can($tag) || croak "Unknown tag '$tag'"; |
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150 | return $meth->($self, $ast); |
151 | } |
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152 | |
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153 | }; |